-18=(7-n)(3)

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Solution for -18=(7-n)(3) equation: 



-18=(7-n)(3)

We move all terms to the left:

-18-((7-n)(3))=0

We add all the numbers together, and all the variables

-((-1n+7)3)-18=0



We calculate terms in parentheses: -((-1n+7)3), so:

(-1n+7)3

We multiply parentheses

-3n+21

Back to the equation:

-(-3n+21)



We get rid of parentheses

3n-21-18=0

We add all the numbers together, and all the variables

3n-39=0

We move all terms containing n to the left, all other terms to the right

3n=39

n=39/3

n=13

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